Multiple GDirections polylines from coordinate pairs

[lwnexgen]

Hi Guys -

I'm working on doing something similar to the person in this post:

http://groups.google.com/group/Google-Maps-API/browse_thread/thread/872736831afeae40/058d237461390f86?lnk=gst&q=gdirections#058d237461390f86

My data is dynamically gathered, however, and I need to plot multiple
polylines between pairs of coordinates on one map. They need to
directly overlay on top of streets, and I also need to be able to
control their color. Therefore, I need to export GPolyLines from
GDirections. Can anyone help me with a code segment that reads in
coordinate pairs and draws lines in between them in this manner? I
can't seem to figure out how to draw more than one at a time on a map.

<script type="text/javascript">
        function initialize() {
                if (GBrowserIsCompatible()) {
                        var map = new GMap2(document.getElementById("map_canvas"
));
                        map.addControl(new GLargeMapControl());
                        map.setCenter(new GLatLng(43.070946, -89.400737), 15);

                        var request = GXmlHttp.create();

                        request.open("GET", "coordinates.xml", true);
                        request.onreadystatechange = function() {

                                if (request.readyState == 4) {
                                        var xmlDoc = 
GXml.parse(request.responseText);
                                        // obtain the array of markers and loop 
through it
                                        var markers = 
xmlDoc.documentElement.getElementsByTagName
("street");
                                        for ( var i = 0; i < markers.length; 
i++) {

                                                // obtain the attribues of each 
marker
                                                var lat1 = 
parseFloat(markers[i].getAttribute("lat1"));
                                                var lon1 = 
parseFloat(markers[i].getAttribute("lon1"));
                                                var point1 = new GLatLng(lat1, 
lon1);

                                                var lat2 = 
parseFloat(markers[i].getAttribute("lat2"));
                                                var lon2 = 
parseFloat(markers[i].getAttribute("lon2"));
                                                var point2 = new GLatLng(lat2, 
lon2);

                                                if ((lat1 != lat2)&&(lon1 != 
lon2))
                                                {
                                                        map.addOverlay(new 
GMarker(point1));
                                                        map.addOverlay(new 
GMarker(point2));
                                                }
                                        }
                                }
                        }
                        request.send(null);
                }
        }
</script>

This is what I have so far - it just parses an xml file and plots the
pairs of coordinates that I need a polyline laid over.

Thanks for any help!

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